The white wall rocket is a very common annual plant. It grows in
disturbed habitats such as uncultivated fields and roadsides. Despite or
because of the fact that it is very common few people actually take enough
interest to look closely at the flowers.
The flowers are white sometimes with a tinge
of violet. Their structure is similar to that of other members of the mustard
family to which the rockets belong. It is made up of four petals arranged in
the form of a cross. The family is also known as the crucifers, meaning cross
bearing, or sometimes as the cabbage family.
After having lain dormant for a whole summer, the seeds of the white
rocket sprout quickly soon after the first autumn rains. Within weeks the plant
starts flowering.
The white rocket is native to southern Europe and the Mediterranean.
Probably as a result of climate change it is now found further north and has even
reached southern England.
The crucifer family is of importance because several species have been
cultivated for thousands of years.
Members of the family include the cabbages,
broccoli, cauliflower, turnip and mustard. The leaves of the white rocket are
similar to those of the cultivated rocket and they are sometimes added to
salads to add a spicy taste. The leaves are said to have diuretic properties
but it seems that the plant is not used medicinally.
Many species of crucifers are food plants for the caterpillars of
various species of white butterflies including the small and cabbage whites
which can become pests of cultivated plants.
Members of the crucifer family are characterised by fruit in the form
of a capsule known as a siliqua. The siliqua is an elongated structure with
seeds inside. The capsule breaks open along a line of weakness in dry
condition. In some species the siliqua breaks open explosively and the seeds
are thrown far and wide away from the parent plant.
This article was published in the Times of Malta on 18 December 2013.
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